End to end 3D demo wiring Blincs SceneKit3D renderer up to

End-to-end 3D demo wiring Blinc's SceneKit3D renderer up to

• blinc_canvas_kit::SceneKit3D — the camera + light + mesh dispatch front-end used by any Blinc app that wants to drop 3D content into a canvas(). Same primitive demos use for a single spinning cube scale up to a full character rig unchanged.
• [blinc_game_kit::gltf] — glTF 2.0 loader. Parses the file tree once at startup into a GltfScene (meshes, nodes, skeletons, animation clips) that the demo holds behind an Arc<Mutex<>> and borrows per frame.
• [blinc_game_kit::skeleton] — runtime poser. animate_scene_nodes samples the clip's TRS channels into the live node tree; scene_skinning_data walks the posed tree to build the joint matrices the mesh shader consumes; animate_scene_morph_weights drives per-node blend-shape weights for facial expression.

The asset is "The Strangler" by Jungle Jim (CC-BY-4.0; https://sketchfab.com/3d-models/the-strangler-06d56efabf7445e89bb1bf41a99d08cc), shipped in the repo for offline reproducibility. Full attribution lives alongside the asset in examples/.../assets/3d/the_strangler/license.txt.

Per-frame flow:

1. animate_scene_nodes(&mut scene, anim, t) — writes sampled TRS onto scene nodes
2. scene_skinning_data(&scene, &skeleton) — returns SkinningData (joint world matrices × inverse-bind)
3. animate_scene_morph_weights(anim, t) — returns a HashMap<node_index, Vec<f32>> of current weights
4. For each drawable node: shallow-clone its MeshData (Arc<Vec<_>> inners → refcount bumps, no vertex copy), stamp the frame's skinning + morph_weights, dispatch via DrawContext::draw_mesh_data.

Ordering (OPAQUE before BLEND) is enforced framework-side in blinc_app::dispatch_pending_meshes, so the demo submits in scene-graph order without its own sort.

cargo run -p blinc_app_examples --example strangler_demo \
    --features gltf --release

<iframe src="../../examples/strangler_demo/index.html" width="100%" height="560" loading="lazy" style="border:1px solid #45475a;border-radius:8px;background:#181825;" title="Blinc strangler_demo example" ></iframe>

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